Anritsu MS2651B Spectrum Analyzer, 9kHz to 3GHz

The Anritsu MS2651B is a synthesized spectrum analyzer operating from 9 kHz to 3 GHz, delivering signal visualization, spectrum monitoring, and RF component evaluation for maintenance and field applications. This portable instrument combines superior basic performance with ease of operation and an extensive built-in measurement suite.

Technical Specifications

• Frequency range: 9 kHz to 3 GHz


• Frequency span accuracy: ±2.5% (spans ≥10 kHz)


• Display frequency accuracy: ± (display frequency × reference frequency accuracy + span × span accuracy + 100 Hz)


• Residual FM: ≤20 Hzp-p/0.1 s (at 1 GHz, 0 Hz span) Amplitude & Dynamic Range


• Amplitude range: Display Average Noise Level (DANL) to +30 dBm


• DANL: ≤–115 dBm (1 MHz to 1 GHz)


• Maximum input level: +30 dBm (CW average power, RF ATT: ≥10 dB), ±50 Vdc


• Level accuracy: ±1.3 dB (with auto-calibration)


• Dynamic range: >80 dB single-screen display Distortion & Linearity


• 2nd harmonic distortion: >70 dB (200–500 MHz)


• 3rd intermodulation distortion: >76.6 dB (100–1000 MHz), >83.3 dB (10–1000 MHz)


• C/N ratio: High C/N characteristics


• Noise sideband: Excellent characteristics Resolution & Filtering


• Resolution bandwidth (3 dB): 1 kHz, 3 kHz, 10 kHz, 30 kHz, 100 kHz, 300 kHz, 1 MHz, 5 MHz (manual or auto)


• Video bandwidth: 1 Hz to 3 MHz (1-3 sequence), OFF (manual or auto)

Key Features

• Frequency counter with 1 Hz, 10 Hz, 100 Hz, 1 kHz resolution; accuracy: Display frequency × reference frequency accuracy ±1 LSD (S/N ≥20 dB)


• FM demodulation with waveform display: 5% accuracy (±10 kHz to ±1 MHz range)


• Dual-screen display for simultaneous multi-parameter viewing


• Measurement functions: C/N, channel power, adjacent channel power, occupied frequency bandwidth, burst average power, template pass/fail


• Zone marker and zone sweep for targeted frequency analysis


• User-defined functions for customized measurement workflows


• Built-in RS-232C and GPIB (IEEE 488.2) interfaces


• Memory card interface for trace data, parameters, and screen image storage (bitmap format)

Typical Applications

• RF component characterization and validation


• Adjacent channel power and occupied bandwidth measurements


• Burst signal analysis and modulation assessment


• Field maintenance and troubleshooting


• Radio equipment evaluation

Compatibility & Integration RS-232C and GPIB (IEEE 488.2) connectivity enable remote instrument control and automated measurement routines. Memory card support facilitates data logging and documentation across multiple test sessions.